# A027280 (b-file synthesized from sequence entry)
3 26
4 164
5 1224
6 7664
7 51488
8 326456
9 2126376
10 13574046
11 87554326
12 560845908
13 3607790136
14 23158545126
15 148945375022
16 957564479960
17 6162874994108
18 39672627184498
19 255578754020002
20 1647166273816172
21 10622076015026288
22 68529892093271816
23 442357250742603624